My! I feel I have lost weight just trying to get my head around this! Has anyone a recommendation for scales that integrate?
The Withings scale will integrate with the Health App. It will send your weight, BMI, and % body fat to Withings (via your wifi connection in your house), and then you can share that with the Health App.
The Fitibit Aria doesn't seem to integrate with anything except Fitbit. As I'm sure most of us know, Fitbit does all it can to lock you into their Ecosystem and keep you there. They'll share data with software apps, but not with any companies that make a competing tracker. There may be others that do a similar thing; these are the 2 I know about.
I have the Withings and it works great.